# Deploy SOLUTION_ERP lên IIS Windows Server.
# Chạy trên target server với admin privilege.
#
# Usage:
#   .\scripts\deploy-iis.ps1 -Artifact "C:\Deploy\solution-erp-20260421.zip" -Site "SolutionErpApi"
#
# Workflow:
#   1. Stop app pool
#   2. Backup current wwwroot
#   3. Extract artifact → publish path
#   4. Run EF migration (dotnet SolutionErp.Api.dll -- --migrate-only)
#   5. Start app pool
#   6. Health check /health/ready — rollback nếu fail

param(
    [Parameter(Mandatory=$true)] [string]$Artifact,
    [Parameter(Mandatory=$true)] [string]$Site,
    [string]$PublishPath = "C:\inetpub\solution-erp\api",
    [string]$AppPoolName = "SolutionErpApi",
    [string]$HealthUrl = "https://localhost/health/ready",
    [int]$HealthTimeoutSec = 30
)

$ErrorActionPreference = 'Stop'
Import-Module WebAdministration

function Write-Step($msg) { Write-Host "==> $msg" -ForegroundColor Cyan }

Write-Step "Deploy $Artifact -> $PublishPath"

# 1. Check prereqs
if (-not (Test-Path $Artifact)) { throw "Artifact khong ton tai: $Artifact" }
if (-not (Test-Path $PublishPath)) { New-Item -ItemType Directory -Force -Path $PublishPath | Out-Null }

# 2. Stop app pool
Write-Step "Stop app pool $AppPoolName"
if (Test-Path "IIS:\AppPools\$AppPoolName") {
    Stop-WebAppPool -Name $AppPoolName -ErrorAction SilentlyContinue
    Start-Sleep -Seconds 3
} else {
    Write-Warning "App pool $AppPoolName chua ton tai. Tao bang cach:"
    Write-Host "  New-WebAppPool -Name '$AppPoolName'" -ForegroundColor Yellow
    Write-Host "  Set-ItemProperty IIS:\AppPools\$AppPoolName -Name managedRuntimeVersion -Value ''" -ForegroundColor Yellow
    throw "App pool missing"
}

# 3. Backup current
$BackupDir = "C:\inetpub\solution-erp\backups\api-$(Get-Date -Format 'yyyyMMdd-HHmmss')"
if (Test-Path "$PublishPath\SolutionErp.Api.dll") {
    Write-Step "Backup current -> $BackupDir"
    New-Item -ItemType Directory -Force -Path $BackupDir | Out-Null
    Copy-Item -Path "$PublishPath\*" -Destination $BackupDir -Recurse -Force
} else {
    Write-Host "  (Khong co build cu, skip backup)"
}

# 4. Clean + extract new artifact
Write-Step "Clean + extract $Artifact"
Get-ChildItem -Path $PublishPath -Recurse -Force | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
Expand-Archive -Path $Artifact -DestinationPath $PublishPath -Force

# 5. Apply EF migrations (call dotnet SolutionErp.Api.dll với arg --migrate-only — Phase 5 impl)
Write-Step "Apply EF migrations"
Push-Location $PublishPath
try {
    # Note: Program.cs check `args.Contains("--no-db-init")`. Default khi start IIS KHONG co arg
    # → migrations tu chay khi app boot len. Neu muon run migration truoc khi app start:
    #   dotnet SolutionErp.Api.dll --migrate-only  (TODO: thêm --migrate-only flag trong Program.cs)
    Write-Host "  (skip — migrations chay tu dong khi app start lan dau)"
} finally {
    Pop-Location
}

# 6. Start app pool
Write-Step "Start app pool"
Start-WebAppPool -Name $AppPoolName

# 7. Health check loop
Write-Step "Health check $HealthUrl (timeout ${HealthTimeoutSec}s)"
$deadline = (Get-Date).AddSeconds($HealthTimeoutSec)
$ok = $false
while ((Get-Date) -lt $deadline) {
    try {
        $resp = Invoke-WebRequest -Uri $HealthUrl -UseBasicParsing -SkipCertificateCheck -TimeoutSec 5
        if ($resp.StatusCode -eq 200) { $ok = $true; break }
    } catch {
        Start-Sleep -Seconds 2
    }
}

if ($ok) {
    Write-Host "`nDeploy SUCCESS" -ForegroundColor Green
} else {
    Write-Warning "`nHealth check FAIL. Rollback thu cong:"
    Write-Host "  Stop-WebAppPool $AppPoolName"
    Write-Host "  Copy-Item $BackupDir\* $PublishPath\* -Recurse -Force"
    Write-Host "  Start-WebAppPool $AppPoolName"
    exit 1
}